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【单选题】
19世纪代数学的巨大成就——群论的发明者是 。A.
德国数学家狄利克雷
B.
法国数学家阿贝尔
C.
法国数学家伽
D.
法国数学家拉格朗日
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【简答题】阅读理解 It was 25th December. Marie，a 13-year-old Australian girl，was happy.It was Christmas and Marie’s mother was a very special cake.She put four small coins(硬币)into the cake and then baked it....
【单选题】The US started a worldwide arms race and the Cold War With the Soviet Union by bombing Japan.
A.
Y
B.
N
C.
NG
【简答题】完形块空。 It was December 25, 1972. Marie, a 13-year-old Australian girl, was happy. It was 1 and Marie's mother made an unusual cake. She put four small coins(硬币)into 2 . This four small coins were for g...
【单选题】下列互为共轭酸碱对的是( )
A.
H 3 PO 4 - PO 4 3-
B.
HAc-Ac -
C.
H 2 CO 3 - HPO 4 2-
D.
H 2 PO 4 - - PO 4 3-
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